如何修复空白的 pygame 屏幕？

如何解决如何修复空白的 pygame 屏幕？

我正在开发一个基本的 pong pygame，我编写了 main.py、paddle.py 和 ball.py 文件，不幸的是，当我运行游戏时，它只显示一个黑色的 pygame 窗口。我的桨、球、网和比分不可见……它只是空白。 Screenshot of Blank/Black Window

以下是我的代码，我已经按文件分开了。

我似乎无法找到导致此错误的原因，因此将不胜感激任何反馈。

MAIN.PY

# Import pygame library and initialize the game engine 
import pygame
from paddle import Paddle
from ball import Ball

pygame.init()

# Define some colors
BLACK = (0,0)
WHITE = (255,255,255)

# Open a new window
size = (700,500)
screen = pygame.display.set_mode(size)
pygame.display.set_caption("Pong")

paddleA = Paddle(WHITE,10,100)
paddleA.rect.x = 20
paddleA.rect.y = 200

paddleB = Paddle(WHITE,100)
paddleB.rect.x = 670
paddleB.rect.y = 200

ball = Ball(WHITE,10)
ball.rect.x = 345
ball.rect.y = 195

# This will be a list that contains all the sprites we intend to use in game.
all_sprites_list = pygame.sprite.Group()

# Add paddles to the list of sprites
all_sprites_list.add(paddleA)
all_sprites_list.add(paddleB)
all_sprites_list.add(ball)

# Loop will carry on until user exits the game (ex. clicks the close button)
carryOn = True

# Clock will be used to control how fast the screen updates
clock = pygame.time.Clock()

# Initialize player scores
scoreA = 0
scoreB = 0 

# ----- Main Program Loop -----
while carryOn:
    # --- Main Event Loop ---
    for event in pygame.event.get(): # user did something
        if event.type==pygame.QUIT: # if user clicked close
            carryOn==False # Flag that we are done so we exit this loop
        elif event.type==pygame.KEYDOWN:
            if event.key==pygame.K_x: # Pressing the x key will quit the game
                carryOn==False

    # Moving the paddles when the user uses the arrow keys (Player A),# or W/S keys (Player B)
    keys = pygame.key.get_pressed()
    if keys[pygame.K_w]:
        paddleA.moveUp(5)
    if keys[pygame.K_s]:
        paddleA.moveDown(5)
    if keys[pygame.K_UP]:
        paddleB.moveUp(5)
    if keys[pygame.K_DOWN]:
        paddleB.moveDown(5)
        
    # --- Game Logic ---
    all_sprites_list.update()

    # Checks if the ball is bouncing against any of the 4 walls
    if ball.rect.x>=690:
        ball.veLocity[0] = -ball.veLocity[0]
    if ball.rect.x<=0:
        ball.veLocity[0] = -ball.veLocity[0]
    if ball.rect.y>490:
        ball.veLocity[1] = -ball.veLocity[1]
    if ball.rect.y<0:
        ball.veLocity[1] = -ball.veLocity[1]

    #Detect collisions between the ball and the paddles
    if pygame.sprite.collide_mask(ball,paddleA) or pygame.sprite.collide_mask(ball,paddleB):
      ball.bounce()

# --- Drawing Code ---

# clears the screen to black
screen.fill(BLACK)

# draws the net
pygame.draw.line(screen,WHITE,[349,0],500],5)

# Draws all sprites in one go (I only have 2 for Now)
all_sprites_list.draw(screen)

# display scores
font = pygame.font.Font(None,74)
text = font.render(str(scoreA),1,WHITE)
screen.blit(text,(250,10))
text.font.render(str(scoreB),WHITE)
screen.blit(text (420,10))

# update screen with what we've drawn
pygame.display.flip()

# limit to 60 frames per second
clock.tick(60)

# Once we have exited the main program loop we stop the game engine
pygame.quit() 

PADDLE.PY

import pygame

BLACK = (0,0)

class Paddle(pygame.sprite.Sprite):
    # This class represents a paddle.  It derives from the "Sprite" class in Pygame.

    def __init__(self,color,width,height):
        # Call the parent class (Sprite) constructor
        super().__init__()

        # Pass in the color of the paddle and it's x and y position (width nd height).
        # Set the background color as transparent
        self.image = pygame.Surface([width,height])
        self.image.fill(BLACK)
        self.image.set_colorkey(BLACK)

        # Draw the paddle which is a rectangle
        pygame.draw.rect(self.image,[0,height])

        # Fetch the rectangle object that has the dimensions of the image
        self.rect = self.image.get_rect()

    def moveUp(self,pixels):
        self.rect.y -= pixels
        # Check that you are not going too far (off screen)
        if self.rect.y < 0:
            self.rect.y = 0

    def moveDown(self,pixels):
        self.rect.y += pixels
        # Check that you are not going too far (off screen)
        if self.rect.y > 400:
            self.rect.y = 400 
    

BALL.PY

import pygame
from random import randint
BLACK = (0,0)
 
class Ball(pygame.sprite.Sprite):
    #This class represents a ball. It derives from the "Sprite" class in Pygame.
    
    def __init__(self,height):
        # Call the parent class (Sprite) constructor
        super().__init__()
        
        # Pass in the color of the ball,its width and height.
        # Set the background color and set it to be transparent
        self.image = pygame.Surface([width,height])
        self.image.fill(BLACK)
        self.image.set_colorkey(BLACK)
 
        # Draw the ball (a rectangle!)
        pygame.draw.rect(self.image,height])
        
        self.veLocity = [randint(4,8),randint(-8,8)]
        
        # Fetch the rectangle object that has the dimensions of the image.
        self.rect = self.image.get_rect()
        
    def update(self):
        self.rect.x += self.veLocity[0]
        self.rect.y += self.veLocity[1]

    def bounce(self):
        self.veLocity[0] = -self.veLocity[0]
        self.veLocity[1] = randint(-8,8)

解决方法

您只是没有在主文件中的主循环中翻转屏幕。
实际上，所有内容都在更新，但屏幕上没有呈现任何内容。

只是打算来自

的代码

# --- Drawing Code ---

到

clock.tick(60)

我想你忘记缩进了。

注意不要在主循环中包含 pygame.quit()。

,

只需添加一个制表层

...
# --- Drawing Code --- 
...

以 main.py 结尾